The Light Cone in String Theory

Details The Light Cone in String Theory The Light Cone in String Theory

1993-04-08

arxiv.org/abs/hep-th/9304037v2

Class.Quant.Grav.10:L187-L192,1993

Physics

High Energy Physics

High Energy Physics - Theory

9 pages; some minor errors corrected; discussion section expanded

Scientific paper

10.1088/0264-9381/10/10/002

The causal boundary of string propagation -- defined as the hypersurface in loop space bordering the timelike(spacelike) domains in which two successive measurements of the string field do(do not) interfere with one another -- is argued to be $0=\int d\sigma\bigl(\delta X(\sigma)\bigr)^2 = \sum_{\ell=-\infty}^\infty \delta x^\mu_{-\ell}\delta x_{\mu \ell}.$ Some possible consequences are discussed.

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